psalm.xml: Fix typo in comment (simplesamlphp#2477)

Author: nikolas

psalm.xml

@@ -22,7 +22,7 @@
     </projectFiles>
 
     <issueHandlers>
-        <!-- Ignore this PHP 8.3 feature until this becomes are minimum required version -->
+        <!-- Ignore this PHP 8.3 feature until this becomes our minimum required version -->
         <MissingClassConstType errorLevel="info" />
 
         <LessSpecificReturnType errorLevel="info" />